JPS61195530U

JPS61195530U -

Info

Publication number: JPS61195530U
Application number: JP8029185U
Authority: JP
Priority date: 1985-05-29
Filing date: 1985-05-29
Publication date: 1986-12-05

Description

[Brief explanation of drawings]

第１図は本考案の光学式ピツクアツプ装置の模
式的平面図、第２図は従来の光学式ピツクアツプ
装置の模式的平面図である。１……光源、２……位相型回折板、３……対物
レンズ、４……デイスク、５……受光素子、１１
……偏光板、１２……波長板。 FIG. 1 is a schematic plan view of an optical pickup device of the present invention, and FIG. 2 is a schematic plan view of a conventional optical pickup device. DESCRIPTION OF SYMBOLS 1... Light source, 2... Phase type diffraction plate, 3... Objective lens, 4... Disc, 5... Light receiving element, 11
...Polarizing plate, 12...Wave plate.

Claims

[Claims for Utility Model Registration] A light source, an objective lens that converges incident light emitted from the light source and incident on the disk onto the disk, and receives at least a portion of the reflected light reflected by the disk. an optical pickup device having a light-receiving element for detecting the incident light, and a diffraction means disposed in the optical path of the incident light and the reflected light for diffracting the incident light into at least two diffracted lights, diffracted by the diffraction means, converging and irradiating one diffracted light onto the disk via the objective lens, and causing the reflected light from the disk to enter the diffraction means via the objective lens;
One of the split beams diffracted by the diffraction means is made to enter the light receiving element, and a polarization plate and a wavelength plate are disposed between the light source and the diffraction means, and the light from the disk is made incident on the light receiving element. An optical pickup device characterized in that reflected light is prevented from returning to the light source.